An Adjoint-based Shape Optimization Design System for the Radar Cross Section Reduction

2021 ◽  
Author(s):  
Ming Li ◽  
Chaoyu Liu ◽  
Feng Qu ◽  
Junqiang Bai
Keyword(s):  
Shape Optimization ◽  
Cross Section ◽  
Optimization Design ◽  
Radar Cross Section ◽  
Design System

Radar Cross Section Reduction and Shape Optimization using Adjoint Method and Automatic Differentiation

2021 ◽  
Vol 36 (3) ◽  
pp. 320-335
Author(s):  
Ming Li ◽  
Junqiang Bai ◽  
Feng Qu
Keyword(s):  
Shape Optimization ◽  
Cross Section ◽  
Optimization Design ◽  
Adjoint Method ◽  
Evaluation Method ◽  
Automatic Differentiation ◽  
Design Method ◽  
Radar Cross Section ◽  
Memory Consumption ◽  
Gradient Based

An efficient Radar Cross Section (RCS) gradient evaluation method based on the adjoint method is presented. The Method of Moments is employed to solve the Combined Field Integral Equation (CFIE) and the corresponding derivatives computing routines are generated by the program transformation Automatic Differentiation (AD) technique. The differential code is developed using three kinds of AD mode: tangent mode, multidirectional tangent mode, and adjoint mode. The differential code in adjoint mode is modified and optimized by changing the “two-sweeps” architecture into the “inner-loop two-sweeps” architecture. Their efficiency and memory consumption are tested and the differential code using modified adjoint mode demonstrates the great advantages in both efficiency and memory consumption. A gradient-based shape optimization design method is established using the adjoint method and the mechanism of RCS reduction is studied. The results show that the sharp leading can avoid the specular back-scattering and the undulations of the surface could change the phases which result in a further RCS reduction.

Aerodynamic Shape Optimization Design of the Swept Wing Based on the Kriging Surrogate Model

2013 ◽  
Vol 444-445 ◽  
pp. 1277-1282
Author(s):  
Dan Wang ◽  
Jun Qiang Bai ◽  
Jun Hua ◽  
Zhi Wei Sun ◽  
Lei Qiao
Keyword(s):  
Shape Optimization ◽  
Surrogate Model ◽  
Optimization Design ◽  
Cfd Simulation ◽  
Free Form ◽  
Design System ◽  
Aerodynamic Shape Optimization ◽  
Swept Wing ◽  
Aerodynamic Shape ◽  
Optimization Search

The aerodynamic shape optimization design system was established in this paper. In the system, the RANS equation was used for solving the flowing; the free form deformation (FFD) method was used for the geometry parameterization, and the genetic algorithm was used for the optimization search. For the reducing of the time cost, the Kriging model was used for the surrogate model instead of the CFD simulation during the optimization design. The aerodynamic shape design of a swept wing was presented which used the system, and the result indicated that the 14% drag coefficient was reduced at the cruise conditions, which proved the validity of the system.

scholarly journals Shape Optimization of an Integrated Mast for RCS Reduction of a Stealth Naval Vessel

2021 ◽  
Vol 11 (6) ◽  
pp. 2819
Author(s):  
Hokeun Shin ◽  
Daeyeong Yoon ◽  
Chanyeong Kim ◽  
Young Sub Yang ◽  
Man Gyu Lee ◽  
...  
Keyword(s):  
Shape Optimization ◽  
Cross Section ◽  
Radar Cross Section ◽  
Naval Vessel ◽  
Shaping Technique ◽  
Sbr Method ◽  
Incident Waves

In this paper, we analyze the radar cross section (RCS) of an integrated mast and present the optimized mast shape for RCS reduction. The RCS is simulated using commercial electromagnetic (EM) software based on the shooting and bouncing rays (SBR) method and the diffraction fields at the edges are also considered. Threat frequencies, threat regions and cardinal points are first defined considering the operational environments of a naval vessel. We calculate and analyze the RCS of the integrated mast in terms of the threat frequencies, the shapes of the integrated mast and the direction and polarization of the incident waves. The shape of the integrated mast is optimized based on the shaping technique. The optimized mast has low RCS properties in the primary threat sectors except for the exceptional angle regions.

Radar Cross Section

2004 ◽  
Author(s):  
Eugene F. Knott ◽  
John F. Shaeffer ◽  
Michael T. Tuley
Keyword(s):  
Cross Section ◽  
Radar Cross Section

Dual-Polarized Metasurface Using Multi-Layer Ceramic Capacitors for Radar Cross Section Reduction

2020 ◽  
Vol E103.B (8) ◽  
pp. 852-859
Author(s):  
Thanh-Binh NGUYEN ◽  
Naoyuki KINAI ◽  
Naobumi MICHISHITA ◽  
Hisashi MORISHITA ◽  
Teruki MIYAZAKI ◽  
...  
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Ceramic Capacitors ◽  
Dual Polarized
Sign in / Sign up

Export Citation Format

Share Document